EXT-8190 PARTIAL FIX Fixed loading indicator infinite spins upon pressing...

EXT-8190 PARTIAL FIX Fixed loading indicator infinite spins upon pressing 'Save' for outfit with non-link items.
- Added inventory collector functor to select items by their actual type.
- Fixed outfit "dirtiness" calculation so only link items are checked.

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/728/.

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branch : product-engine